diff --git a/notes/color-video.md b/notes/color-video.md
index 086da64..a119901 100644
--- a/notes/color-video.md
+++ b/notes/color-video.md
@@ -1,5 +1,5 @@
 # Color Video
-- 307_200/0x4_B000 Bytes needed
+- 307 200/0x4 B000 Bytes needed
 - 9\*32K RAM chips (AS7C256C-15PCN)
 - consider: memory needs to be duplicate
 - TR9C1710
diff --git a/notes/monochrome-video.md b/notes/monochrome-video.md
index 8cf7ae7..12c388c 100644
--- a/notes/monochrome-video.md
+++ b/notes/monochrome-video.md
@@ -1,5 +1,5 @@
 # Monochrome Video
-- need 307_200 bits => 38_400/0x9600 Bytes 
+- need 307 200 bits => 38 400/0x9600 Bytes 
 - 8K character memory
 
 - 1x 64K RAM
diff --git a/notes/vga.md b/notes/vga.md
index 543abff..ccfe88b 100644
--- a/notes/vga.md
+++ b/notes/vga.md
@@ -26,4 +26,4 @@
 | Whole frame  | 525   | 16.683217477656   |
 
 ## Additional Data
-- 640*480 = 307_200
+- 640*480 = 307 200